11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Generic HDLC support routines for Linux 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * HDLC Ethernet emulation support 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 5eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa * Copyright (C) 2002-2006 Krzysztof Halasa <khc@pm.waw.pl> 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This program is free software; you can redistribute it and/or modify it 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * under the terms of version 2 of the GNU General Public License 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * as published by the Free Software Foundation. 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/errno.h> 134dfce4075aa4e2eee35e52a78dbabfe37d94c908Krzysztof Hałasa#include <linux/etherdevice.h> 145a0e3ad6af8660be21ca98a971cd00f331318c05Tejun Heo#include <linux/gfp.h> 154dfce4075aa4e2eee35e52a78dbabfe37d94c908Krzysztof Hałasa#include <linux/hdlc.h> 161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/if_arp.h> 174dfce4075aa4e2eee35e52a78dbabfe37d94c908Krzysztof Hałasa#include <linux/inetdevice.h> 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/init.h> 194dfce4075aa4e2eee35e52a78dbabfe37d94c908Krzysztof Hałasa#include <linux/kernel.h> 204dfce4075aa4e2eee35e52a78dbabfe37d94c908Krzysztof Hałasa#include <linux/module.h> 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/pkt_sched.h> 224dfce4075aa4e2eee35e52a78dbabfe37d94c908Krzysztof Hałasa#include <linux/poll.h> 231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/rtnetlink.h> 244dfce4075aa4e2eee35e52a78dbabfe37d94c908Krzysztof Hałasa#include <linux/skbuff.h> 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 26eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasastatic int raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr); 271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 28d71a674922e7519edb477ecb585e7d29d69c7aa7Stephen Hemmingerstatic netdev_tx_t eth_tx(struct sk_buff *skb, struct net_device *dev) 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int pad = ETH_ZLEN - skb->len; 311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (pad > 0) { /* Pad the frame with zeros */ 321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int len = skb->len; 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (skb_tailroom(skb) < pad) 341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (pskb_expand_head(skb, 0, pad, GFP_ATOMIC)) { 35198191c4a7ce4daba379608fb38b9bc5a4eedc61Krzysztof Halasa dev->stats.tx_dropped++; 361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_kfree_skb(skb); 371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds skb_put(skb, pad); 401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds memset(skb->data + len, 0, pad); 411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return dev_to_hdlc(dev)->xmit(skb, dev); 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 46eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasastatic struct hdlc_proto proto = { 47eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa .type_trans = eth_type_trans, 48991990a12de42281f81b4e3a6471586d2d0caf6aKrzysztof Hałasa .xmit = eth_tx, 49eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa .ioctl = raw_eth_ioctl, 50eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa .module = THIS_MODULE, 51eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa}; 52eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa 53eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa 54eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasastatic int raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr) 551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc; 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds const size_t size = sizeof(raw_hdlc_proto); 581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds raw_hdlc_proto new_settings; 591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds hdlc_device *hdlc = dev_to_hdlc(dev); 60991990a12de42281f81b4e3a6471586d2d0caf6aKrzysztof Hałasa int result, old_qlen; 611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds switch (ifr->ifr_settings.type) { 631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case IF_GET_PROTO: 64eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa if (dev_to_hdlc(dev)->proto != &proto) 65eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa return -EINVAL; 661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ifr->ifr_settings.type = IF_PROTO_HDLC_ETH; 671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ifr->ifr_settings.size < size) { 681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ifr->ifr_settings.size = size; /* data size wanted */ 691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENOBUFS; 701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 71eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa if (copy_to_user(raw_s, hdlc->state, size)) 721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EFAULT; 731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case IF_PROTO_HDLC_ETH: 761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!capable(CAP_NET_ADMIN)) 771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EPERM; 781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (dev->flags & IFF_UP) 801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EBUSY; 811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copy_from_user(&new_settings, raw_s, size)) 831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EFAULT; 841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (new_settings.encoding == ENCODING_DEFAULT) 861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds new_settings.encoding = ENCODING_NRZ; 871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (new_settings.parity == PARITY_DEFAULT) 891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds new_settings.parity = PARITY_CRC16_PR1_CCITT; 901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds result = hdlc->attach(dev, new_settings.encoding, 921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds new_settings.parity); 931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (result) 941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return result; 951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9640d25142f2ef27084fc317ac8bb5bae460c8ea72Krzysztof Halasa result = attach_hdlc_protocol(dev, &proto, 97eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa sizeof(raw_hdlc_proto)); 98eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa if (result) 99eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa return result; 100eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa memcpy(hdlc->state, &new_settings, size); 1011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds old_qlen = dev->tx_queue_len; 1021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ether_setup(dev); 1031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev->tx_queue_len = old_qlen; 104f2cedb63df14342ad40a8b5b324fc5d94a60b665Danny Kukawka eth_hw_addr_random(dev); 1054bc83b4d409edacb33db6c71d03e963d9728476cKrzysztof Halasa netif_dormant_off(dev); 1061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 1071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 1101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 111eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa 112eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa 113eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasastatic int __init mod_init(void) 114eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa{ 115eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa register_hdlc_protocol(&proto); 116eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa return 0; 117eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa} 118eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa 119eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa 120eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa 121eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasastatic void __exit mod_exit(void) 122eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa{ 123eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa unregister_hdlc_protocol(&proto); 124eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa} 125eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa 126eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa 127eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasamodule_init(mod_init); 128eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasamodule_exit(mod_exit); 129eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof Halasa 130eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof HalasaMODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); 131eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof HalasaMODULE_DESCRIPTION("Ethernet encapsulation support for generic HDLC"); 132eb2a2fd91f7c8a53b15063d6f08cf22b9a56cbfbKrzysztof HalasaMODULE_LICENSE("GPL v2"); 133